{
  "$schema": "http://json-schema.org/draft-07/schema",
  "definitions": {
    "channel_id": {
      "type": "string"
    },
    "timestamp": {
      "type": "string"
    },
    "user_id": {
      "type": "string"
    },
    "message.groups": {
      "type": "object",
      "description": "learn more: https://api.slack.com/events/message.groups",
      "properties": {
        "channel": {
          "$ref": "#/definitions/channel_id"
        },
        "channel_type": {
          "const": "group"
        },
        "event_ts": {
          "$ref": "#/definitions/timestamp"
        },
        "text": {
          "type": "string"
        },
        "ts": {
          "$ref": "#/definitions/timestamp"
        },
        "type": {
          "const": "message"
        },
        "user": {
          "$ref": "#/definitions/user_id"
        }
      },
      "example": {
        "channel": "G024BE91L",
        "channel_type": "group",
        "event_ts": "1355517523.000005",
        "text": "One cannot programmatically detect the difference between `message.mpim` and `message.groups`.",
        "ts": "1355517523.000005",
        "type": "message",
        "user": "U2147483697"
      }
    }
  }
}